Definition and Construction of Screws

Screws and nuts are common fasteners that have significant differences in construction, use, and design. Here is a detailed comparison between the two:

1、 Definition and Construction

screw

Definition: A screw is a metal rod with threads, which can be coarse or fine, and the direction of the helix varies depending on the purpose.

Construction: Screws typically consist of a stem with external threads and a head for rotation and torque application.

Nut

Definition: A nut is a supplementary component of a screw, used in conjunction with the screw to increase the stability of the connection.

Construction: A nut is usually a metal block with internal threads, often hexagonal in shape, making it easy to rotate using tools such as a wrench.

2、 Purpose:

screw

It is mainly used to fix two objects and firmly connect them together through metal rods and threads, providing overall reinforcement.

Nut

Used in conjunction with screws, the friction between the screw and the workpiece is increased by tightening the nut, making the connection more stable.

The nut itself does not directly fix the object, but achieves the fastening effect by cooperating with the screw.

3、 Types and materials

screw

There are various types, including self tapping screws, wood screws, machine screws, etc., depending on their purpose and shape.

The material is usually metal, such as iron, copper, stainless steel, etc., selected according to the usage scenario and requirements.

Nut

There are also various types, such as hex nuts, round nuts, butterfly nuts, locking nuts, etc., to meet different fastening requirements and installation spaces.

The materials are equally diverse, including carbon steel, stainless steel, copper, aluminum, etc., to meet different corrosion resistance and strength requirements.

4、 Usage method

screw

Usually, a screwdriver or power tool is used for rotation and tightening.

In some cases, screws can self pierce into the material without the need for pre drilling.

Nut

Use tools such as wrenches and sockets to rotate and tighten.

It needs to be used in conjunction with screws, usually by threading the screw through the connected object before tightening the nut.

In summary, screws and nuts have significant differences in definition, construction, purpose, types and materials, as well as usage methods. In practical applications, it is necessary to select appropriate fasteners based on specific connection requirements and scenarios.